Radio direction finder apparatus



Aug. 29, 1933. 515 1,924,408

RADIO DIRECTION FINDER APPARATUS Filed April 2, 1929 avwemtoz AUGU 5T LEIB Patented Au 29, 19331;

. h 1,924,408 i RADIO mamas FINDER ArrAnA'r s.

I August Leiby'zBerlin, Germany, assignor to Telefunlren Gesellschaft. fiir llrahtiose Tole- I I -.gr aphie, m. b. H, Berlin, Germanypacorporationef Germany v -fApplicatid-April 2, 1929, Serial No; 351,892, and in Germany April 13, 1928. v

2 Claims... c1. 2-50-11) tween goniometer coil and auxiliary antenna,

sources of current for the'filament and for the plate, or else choke-coil filters and resistances to derive this energy from'asupply network, and, optionally, charging apparatus forthe sources.

Direction-finders as, heretofore built comprise a great number of constituent parts. The mounting of such outfits requires a relatively large spaceand was attendedwithgr'eat expense. 6111 some. forms ofgconstruction, the directionfinder outfit was combined in one unit or assembly, the main partof the equipment being mounted .on the'fioor of the direction-finder I room, while the directional antenna and the auxgiliary antenna. had to be brought in through the "ceiling separately. These unitaryforms of constructionftherefore required, a certain amount of 'floor space, and separate boxes for the sources and the charging deviceswere needed. Hence,

' they didnotfyet 1 measure up to the highest. f fdemands as regards simplicity of building and minim'um spacere uirements. H V

The object of the present invention isto 1 provide apparatus so constructed, and positioned a V 1 the series resistance and choke-coil networks for These drawbacks are obviated according to the v present invention by that the complete direction.- a

asto overcomethe above disadvantages.

finder outfit including directional and auxiliary 'rection-finder room. 1 3

Other objects and advantages will become apparent from the specification and therefrom :When read in connection with the accompanying drawing in which j the] single jfigure shows, forpurposes of illustration, apparatus constructedinaccordance with the present invention. I

Referring tothe drawing,..l denotes a metallic protection envelope for the directional antenna 'or loop accommodated thereirn The weatherproof envelope'serves at the same time as the auxiliary antenna. .111 order to enlarge its effectiveness. as an auxiliary antenna, extension rods 2 could be fitted thereto, if desired. I

.wall and underneath the bottom of the box:

loop;

porter construction 4. ,Inside 3 arelaid all of theleads brought to the receiver apparatus. 5 is a rain protectorattached to the shaft to shed thewater.

6 isa foundation plate for the securing of the entire outfit. The later is'fitted into a large hole 7 in ceiling 8 of the direction-finder room or house, and is packed by "interposition of rubber rings or Washers 9 or rings made from similar material. 7

- 6 19 is'an outfit box which is attached to the foundation or base plate 6 and inside which all receiver amplifiers and accessories pertaining to the'direction-finder are accommodated.

.In the drawing are visible upon the anterior Hand-wheel .11 for turning the directional Dial 12 for goniorneter readings. Sockets 13 for connecting the telephone 14.

Wave tuning knob 15. I 1 Switch 16 for changing from direction-finding to determination of the line of direction.

, Coupling 1'7 for setting sharp goniometer read- Instruments 18 for testing batteries and tubes,

, and

, 19, the-"connection with the supply line of the vessel-from which either the working energy or plers, the tuning coils and the tuning condensers,

the batteries for the filament and the plate, or

deriving current from the ships supply line as Well as such other auxiliaries as may be provided to facilitate operations.

' antenna are assembled inone block or unit 4 0 adapted to be insertedinjthe ceiling of the di- .Ihe-novel outfit has the following merits so far as its mounting is concerned;

The entire outfit can be built and assembled in the factory ready for use and bethere tested for tightness, and it can thereupon be secured inia very simple mannerby fitting the finished direction-flnder unit into the ceiling of the room 9 where it is to be used. .All that has to'be done furthermore vis'to attach" the terminals 19. The

direction-finder unit here disclosed offers best chances for favorable space utilization. For instance, it may be fitted in the chart house above the chart desk for the surface for laying down .the charts is not encumbered. It is also possible to mount the outfit in theinteriOr of the pilot house. For instance, it could be fitted in a space drical member terminating in a frame aerial shield enclosing a frame aerial system, a pair of linear absorption members symmetrically supported by said shield, said absorption members taken with said shield constituting a vertical aerial, receiving means fixed-to the other side of said base member, said receiving means being adapted to derive energy from said aerial systems, and means adjacent said receiver for rotating said support and said aerial systems.

2..A directional receiver comprising a base member adapted for mounting, a support rigidly fastened to said base'member, a complete electrostatic shield, said shield being rotatable withsaid frame aerial, and upwardly extending vertical absorbing means electrically symmetrical. supported by saidshield, said vertical absorbing means cooperating-With said shield to constitute a vertical aerial, receiving means fixed to the other side of said base member, said receiving means being adapted to deriveenergy from said aeriaL'and means adjacent to said receiver for rotating said support and said aerial systems.

AUGUST LEIB. 

